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File Type Access Controls in Firefox-Settings

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How do I prevent Firefox (which isn't even active) from activating and opening a tab when I use Windows Explorer to double-click-to-open a .DOC file? This is new behavior. How do I disable it. I don't want any application to access (even addresses) of an object I reference unless I specifically ask it to. When I activate Windows Explorer - I don't expect (or want) Firefox throwing up tab panels with the address in it.

How do I prevent Firefox (which isn't even active) from activating and opening a tab when I use Windows Explorer to double-click-to-open a .DOC file? This is new behavior. How do I disable it. I don't want any application to access (even addresses) of an object I reference unless I specifically ask it to. When I activate Windows Explorer - I don't expect (or want) Firefox throwing up tab panels with the address in it.

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